John lee eobison



(No Model.)

J. L. 'RORISON.

COMPOSITE MIGA SHEET.

No. 308,199. Patented NOV. 18, 1884.

INVENTOR WITNESSES:

ATTORNEYS.

' sage of the rivet c.

UNITE STATES ATENT FFICE.

COMPOSITE MICA SHEET.

SPECIFICATION forming part of Letters Patent No. 308,199, dated November18, 1884.

Application tiled January 5, 1884. (No model.)

To all whom it may concern-.-

Be it known that I, JOHN L. RORISON, of Bakersville, county of Mitchell,North Oarolina, have invented. a new and improved Composite Mica Sheetfor Stoves, &c., of which the following is a full, clear, and exactdescription.

My invention consists in the employment of several small pieces orsheets of mica for making large sheetssheets of suflicientsize to beused in illuminated stoves and in other places as hereinafter set forthin the claims.

Reference is to be had to the accompanying .drawings, forming part ofthis specification;

in which similar letters of reference indicate corresponding parts inall the figures.

Figure 1 is a front elevation of a large sheet of mica made up offoursmall pieces or sheets. Fig. 2 shows the method of preparing theedges of the small pieces of mica to be united when two small pieces ofmica are used; and Fig. 3 is a sectional elevation taken on the line 00x of Fig. 1, showing the preferred method of securing the small sheetsor pieces of mica at their contiguous edges or corners. A represents thecompleted sheet of mica. This is composed of the four small pieces orsheets I) b of mica, which are held together at their contiguous cornersby the rivet c and washer d. In uniting these four pieces of mica theinner corner of each sheet is slightly cut away, so that when they areput together a central opening will be formed for the pas- The two inneredges of each small sheet I) are notched or slotted, as shown ate, neartheir outer ends or edges, and when the pieces are put together theopposite edges to those in which the slots are made are placed in theslots 6, as shown in Fig. 1, so that the edges lap past each other,forming good joints, and are at the same time locked together. Thecontiguous edges of the small pieces b I) being properly placed together, the rivet c is then inserted, and then the washer d is placedupon the smaller end of the rivet and the rivet headed down, so as tocause the head 0 of the rivet and the outer edges of the washer to graspand firmly hold the small pieces 12 b of mica, as will be understoodfrom Fig. 3, thus making the sheet A as firm and strong and durable asthough it were one continuous sheet of mica. WVhen only two small piecesor sheets b of mica are used for making the large sheet, the twoeontiguous edges of the pieces will be slotted, as shown at e, in Fig.2, to form thelap and lockjoint, and in the center the two contiguousedges will be cut away, as shown at f, to form a passage for the rivetc,'so that by heading the rivet upon the washer d the two sheets will beheld firmly together.

I am aware that a stove-pipe has been formed of a sheet-metal platehaving alternate projections and recess on its longitudinal edges, saidprojections being bent at their junction with the body of the pipe.These projections overlapped adjacent portions of the body; but the bodyportions themselves did not overlap at any point, and I do not claim anysuch construction. Y

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The sheet A of mica, composed of the small sheetsI), slitted on their adjacent edges at opposite ends, as shown at e, toallow the entire edges to overlap and lock, and a rivet and washer forsecuring said adjacent edges together, substantially as shown.

2. The sheet of mica A, composed of small sheets I), slitted on theiradjacent edges at 0pposite ends and notched at f f, to allow of acentral aperture being formed when the edges are overlapped andinterlocked, and a rivet, c, passing through said aperture and'securedby washer d, substantially as set forth.

JOHN LEE RORISON.

\Vitnesses:

S. J. TURNER, J. S. PENLAND.

